another cardboard creation

Double layered corrugated cardboards, 

each with edge crush weight specified at 82lb, 

multiply that by the countless number of layers bonded with non-toxic school glue...

 this thing can withstand tons of weight force!!!!

solid double layer shelf with milk carton drawers

Each double layer has 85lb corner crush weight specification.  Multiply that by 50 layers ....
You can probably stand an elephant on it!  But turn it on its side or get it wet and then I'm not so sure...